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નીચે આપેલ આકૃતિ એ સજીવની તેના અજૈવિક પરિબળો સામે પ્રતિચારની રજૂઆત કરે છે. $i,ii$ અને $iii$ અનુક્રમે શું રજૂઆત
$i$ || $ii$ || $iii$

રૂઢિઅનુસરતાં || નિયામક || અંશતઃ નિયામક
નિયામક || અંશતઃ નિયામક || રૂઢિઅનુસરતાં
અંશતઃ નિયામક || નિયામક || રૂઢિઅનુસરતાં
નિયામક || રૂઢિઅનુસરતાં || અંશતઃ નિયામક
Solution
(d) : Some organisms are able to maintain homeostasis by physiological (sometimes behavioural also) means which ensures constant body temperature, constant osmotic concentration, etc. They are known as regulators. A majority of animals and plants cannot maintain a constant internal environment. Their body temperature changes with the ambient temperature. These animals and plants are simply conformers. During the course of evolution, the costs and benefits of maintaining a constant internal environment are taken into consideration. Some species have evolved the ability to regulate, but only over a limited range of environmental conditions, beyond which they simply conform. They are known as partial regulators.